When you swing open the stall door in a public restroom and find a huge gnarly dump left in the toilet, probably jamming it, prompting a hasty retreat - that's a "Limbaugh".

"No, don't go in that one, man - there's a Limbaugh in there!" "Whoa, that's is possibly the worst Limbaugh I have ever smelled!"
"Why don't they get someone to come in here and hose out this Limbaugh?"